White cast iron is a material that is difficult to machine. Due to its high hardness and brittleness, the turning tools is very easy for chipping or the tool is not wear-resistant, which 

affects the tool life. The cutting tools such as carbide inserts , ceramic inserts and solid cbn inserts, are becoming more and more widely used.

However, white cast iron has high hardness and high brittleness. When the carbide iinserts machining the white cast iron, it wears quickly and are difficult to process normally; 

due to the high brittleness of ceramic inserts, it is easy to encounter casting defects such as sand inclusions and air holes crash, and generally only used in finishing. LINKUT 

PCBN inserts such as RNGN090300 with high hardness, excellent wear resistance and impact resistance, which makes it become the fittest type for white cast iron machining

and realized the high cutting efficiency.